Which ant species has an evenly round thorax?

The carpenter ant is recognized for its significantly round and smooth thorax. This characteristic is crucial for identifying the species, as the thorax shape distinguishes it from other ant species that may have more irregular or angular thorax shapes. Carpenter ants typically also have large mandibles and a well-developed head, contributing to their distinct appearance. In contrast, fire ants have a more pronounced, uneven thorax shape, while pavement ants are generally smaller with a less rounded thorax. The velvety tree ant has a more slender thorax with angles that are not as smooth as that of the carpenter ant. Understanding these physical traits is essential for accurately identifying different ant species in pest control.